- Accepted Paper
Glory interference spectroscopy in alkali-metal atoms: Atom-dependent effects
APS Open Sci. - Accepted 10 November, 2026
DOI: https://doi.org/10.1103/9fh6-b568
APS Open Sci. - Accepted 10 November, 2026
DOI: https://doi.org/10.1103/9fh6-b568
In a recent series of investigations, slow photoelectron imaging spectroscopy was applied to near-threshold photoionization of simple atoms (Mg, Sr) in the presence of a static electric field, focusing specifically on the glory effect. The term is borrowed from classical scattering and de-notes the divergence of the classical scattering cross section when the deflection function goes through zero for a nonzero impact parameter. In the case of slow photoelectron imaging the glory effect manifests itself as an intense peak at the center of the photoelectron momentum distribution. Fourier analysis of the observed modulation of the glory signal magnitude as a function of (posi-tive) excitation energy, above the zero-field limit, provided a direct, atom-independent link with the time-delays between pairs of source-to-detector classical trajectories contributing to the glory effect. This discovery offered a quantitative and extremely stringent test of the application of the correspondence principle to the continuum spectrum of a simple quantum system. Experiments and calculations were found in good mutual agreement in the positive energy range and, at the same time, revealed a more complex, presumably atom-dependent, situation below the zero-field limit where quasi-bound states and continua coexist. In addition, the question of excitation-scheme-specific issues of the glory signal remained still open. To gain a deeper understanding of the glory spectra in the negative energy range and to an-alyze the influence of the target atom and the excitation-scheme, we present a series of calcula-tions for the hydrogen atom and all alkali atoms (Li to Cs). Total ionization cross sections and glo-ry spectra are calculated in the framework of Harmin-Fano Frame Transformation Stark Theory. The comparison between calculated glory spectra and their Fourier components for these single-valence-electron atoms allows us to follow the evolution of spectral structures in the positive and negative energy domain and draw more general conclusions as compared to earlier studies. In par-ticular, it is found that the negative energy glory spectra show traces of apparently classical origin, which are nevertheless strongly perturbed by the atom specific resonant Stark structure.
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